# A149070 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 11 4 42 5 175 6 755 7 3318 8 14897 9 67934 10 313320 11 1457186 12 6834042 13 32249951 14 152963363 15 728772478 16 3485974666 17 16728898237 18 80509755123 19 388466875840 20 1878628301984 21 9102952302638 22 44187666497748 23 214844863711924 24 1046105281413402 25 5100271714845970 26 24896244561277645 27 121660675201413859